MapRenderer: Do not call map_to_screen so often for Orthogonal maps.

Fixes #326 for orthogonal maps.
Increase the size of the dot showing the hero on the minimap.
Don't invalidate iterators again!
Remove cppcheck warnings.
Merge pull request #459 from stefanbeller/largerheroonminimap

Increase the size of the dot showing the hero on the minimap.
Merge pull request #458 from dorkster/bugfixes

Add option for equipment to apply when transformed
Merge pull request #457 from stefanbeller/speeduprender

MapRenderer: Do not call map_to_screen so often for Orthogonal maps.
Merge pull request #460 from igorko/master

Don't invalidate iterators again!
Update engine.pot file.
Merge pull request #462 from stefanbeller/master

Remove cppcheck warnings, update port file.